I had a very comfortable and enjoyable stay at Vestel. It's located above the Vespa showroom along the BTS in the Ari neighborhood, within 10 min walk to Ari BTS station (which is connected to the Airport Link).
Khun Nat was prompt in his responses to me once I booked my bed. The only issue I had was trying to get my luggage out from reception after checking out early and returning from spending day in the city. There was no one at reception and thé cleaning Lady didn't hear the doorbell so I had to call Khun Nat.
The bed/dorm room is as shown in photos...very clean, modern and bright. The common rooms on 3&4 floors were great...there is a fridge on 4th flr; kettle and coffee and tea on 3rd. The toilets and showers are clean. My only concern is if the six beds were all occupied there is only one toilet and shower.
The road is smooth between the BTS station and Vestel so no problems with rolling suitcases and walking to Vestel from BTS. Budget at least 1.5 - 2 hours travel time from Ari BTS to the airport via Airport Link tho if that's the way you get in and out of town. Vestel is on a main road so didn't seem like catching a taxi was an issue.
The Ari neighborhood along Phahonyothin Road Soi 7 is full of excellent restaurants, street food, cake and coffee shops and local markets. Worth exploring. Lots of Thai food choices within steps of Vestel too. I recommend checking out Bahn Mae Yui inside the neighborhood behind Vestel for a nice Thai dining experience (no tourists there).